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However, it is very annoying that 200 series stainless steel and 300 series stainless steel are difficult to see from the surface, even if experts are difficult to distinguish. In order to prevent users from losing, we here teach you how to identify the stainless steel used in stainless steel tanks.
The simple and practical method of distinguishing the stainless steel water tank material from 200, 300 series stainless steel is as follows:
1. Touch the magnet to see if it is magnetic. Unless otherwise specified, magnetic attraction is generally not the case, and magnetic attraction may be replaced by low-grade ferrite material (eg, 430).
2. It is unscientific and wrong idea to judge the quality of stainless steel with only magnetic properties. Our concept led to the market's low-nickel, low-chromium but non-magnetic stainless steels rushing down and tricking users. The use of stainless steel water tank products for a short period of time can cause corrosion, fracture, and swelling. Since the 200 series stainless steel and the 300 series stainless steel are no different from the surface, they are also non-magnetic. The only way to identify the quality of the stainless steel is to go to the local mechanical institute or a unit that has the capability of metal testing to do chemical composition analysis.
3. When purchasing stainless steel water tanks, you must let the manufacturer specify the material of the product and ask him to issue a material certificate and guarantee. In order to prevent economic losses and leave potential hidden dangers to the project, please select a regular stainless steel tank manufacturer!
The stainless steels currently sold in the Chinese market are mainly the 300 series and the 200 series. The difference between the two is the amount of nickel in the chemical elements, which causes a huge difference in their performance and price. At the current nickel price level, 200 series stainless steel with a very low nickel content is only about half the price of 300 series stainless steel, and it is far inferior to 300 series stainless steel in terms of corrosion resistance, toughness and other properties. It is only suitable for kitchen utensils, food processing, etc. The field, if used in construction, medical equipment and other fields, will have great hidden dangers. The 200 series products containing about 1% nickel cannot withstand general atmospheric corrosion.